Automatic frisket for hand-presses



{No Model.)

2 Sheets-Sheet 1.

L.D.GLAR K.

AUTOMATIC I'R'ISKET FOR HAND PEP-883$.

a N 4 464,856. Patented Dec. 8,1891.

211v VENTO}? BY I v QW ATTORNEYS W/TNESSES UNITED STATES PATENT OFFICE.

LORENZO D. CLARK, OF FORT JONES, CALIFORNIA.

AUTOMATIC FRISKET FOR HAND-PRES SE'S.

SPECIFICATION forming part of Letters Patent No. 464,856, dated December8; 1891. Application filed December 13, 1390. Serial No. 374,542. (Nomodel.)

To all whom it may concern:

Be it known that 1, LORENZO D. CLARK, of Fort Jones, in the county ofSiskiyou and State of California, have invented a new and ImprovedAutomatic Frisket for Hand-Presses, of which the following is a full,clear, and exact description.

Myinvention relates to an automatic frisket for hand-presses, and hasfor its object to provide a device capable of being more expeditiouslyand conveniently handled than the friskets ordinarily used and whichwill maintain a perfect register and consequently secure accurate work.

A further object of the invention is to so construct the device that itwill be exceedingly simple and capable of manipulation by a boy withequal facility and with as good results as at the hands of a skilledpressman as far as relates to the operation of this improvement. 4

The invention consists in the novel c011- struction and combination ofthe several parts, as will be hereinafter fully set forth, and pointedout in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar figures and letters of refer enceindicate corresponding parts in all the views.

Figure 1 is a side elevation of the device, the tympan being elevatedfrom the bed and the bed partly in section; and Fig. 2 is a sectiontaken through the bed on the line 00 :c of Fig. 1 and an elevation ofthe tympan with the improvements attached. Fig. 3 is a plan view of thedevice, the tympan being folded down upon the bed to print the sheetcarried thereby. Fig. 4 is a side elevation of the device when in theposition shown in Fig. 3, and Fig. 5 is a partial vertical sectionthrough the device when in the open position shown in Fig. 1.

The bed 10 may be of any approved or of the ordinary construction, andthe tympan 11 is hinged at its lower end to one end of the bed in themanner usually adopted in the construction of hand-presses.

Upon one side of the bed, at the end adjacent to the tympan, a shoe 12is adjustably secured, which shoe, as shown in Fig. 1, consists of abody portion a, engaging longitudinally with the bed, provided withslots ct, through Which screws or their equivalents are passed, an ear aextending horizontally .and at a right angle from one end of the body,and an extension or offset a projecting vertically from the uppersurface of the body at the opposite end. The upper end of the extensionor offset is a cam-surface, being beveled from the tympan in directionof the bed, and in the upper edge of the shoe-body, between its ends, acavity a is produced to admit of the perfect closing of the tympan withthe shafts and bearings attached, as hereinafter described.

The tympan 11 preferably consists of a main frame 13, as shown in Fig.3, covered with canvas or fabric of any description, and an auxiliaryframe 14, fitted within the main frame at the back and removably securedthereto in any approved manner to admit of the use of a blanket or otherpacking ordinarily used in press-work. Near the lower or hinged end ofthe tympan a shaft 15 is transversely journaled, three bearings 15 beingusually employed, one near each end and the other 'at or near thecenter, which bearings are secured to the tympan and may be soconstructed as to admitof adjustment to any size of form.

Upon the end of the shaft projecting over the offset of the bed-shoe adisk 16 is rigidly attached, provided with a wrist-pin 17, projectingfrom both faces of the disk, theinner section of the pin being adaptedto ride upon the cam-surface of the bed-shoe offset ta The outersect-ion of the wrist-pin 17 is connected by a link 18 with the bed bymeans of the car a of the bed-shoe. One end of the link is pivoted tothe pin, and the body of the link is so curved that its other end isenabled to pass throughan openingin the lower portion of the ear (0 andslide freely therein. The link thus has a sliding connection with thebed through the medium of the said shoe. The extremity of the slidingend of the link:

is enlarged or bent at an angle to the body to.

prevent it from slipping through the opening in the car, as shown inFig. 3, drawing the wrist-pin 17 back to its original position when thetym pan comes to a rest upon its upward movement.

Upon the end of the shaft 15 opposite that 1 downward, and the grippers,by reason of the having the disk attached a head-block 19 issecured;which head-block extends about an equal distance beyond thesides of the shaft, the head-block being perforated at either end totake crank-pins or ends of connecting-rods,

either of which maybe used in construction.

At the upper end of the tympan a transverse shaft 20 is journaled insuitable bearings 21, the said shaft beingparallel with the lower shaft15.. The upper shaft is provided with a crank-arm 22 at one end and ahead-block 23 at its opposite end,correspondingin shape and location tothe head-block of the lower shaft. The extremities of the twoheadblocks19 and 23 are connected by rods 24: and 25, which cross one another attheir centers and at said central portions move in guide-sleeves 26,secured to one side 01' the tympan, as shown in Fig. 2.

Each shaft 15 and 20 isprovided with grippers 27, secured thereon, whichgrippers are adapted to normally engage with the inner face of thetympan or with the paper to be printed, holding the same in engagementwith the tympan, and in printing a form smaller than the full size oftympan an extra frame-piece or rest is attached in the same relativeposition to the gripper-shaft as the inner frame of the tympan occupiesin printing a full form.

Upon theback of the tympan, at one side, a handle 28 is attached, theupper end of the said handle being preferably shaped to form a socket toreceive the lower end of a spring 29. The upper end of the spring isfree and is pivotally connected by a link 30-with the crank-arm of theupper transverse shaft 20, and the tension of the spring is in adirection opposite to or away from the face of the tympan, so thattension is exerted at all times upon the crank-arm of the uppertransverse shaft. When the grippers are closed upon the paper, thecrank-arm extends vertically connection between the two shafts, are heldby the springin their closed position. hen, however, the grippers aremanipulated to release the paper and the crank-arm is carried upwardover the center of its radius, the spring acts to hold the said grippersopen after the same have been brought to that position by the linkworking in the eye of the shoe.

In order that the paper to be printed upon may not become smutted orsoiled, two guardstrips 31, of any light material, are attached to thetympan at their lower ends below the lower shaft 15, and said guards areso located that when the tympan is closed down upon movement of thesheets until said sheets are engaged by the grippers. I

In operation, when the tympan is carried to a vertical position, whichmay be done by means of the handle 28 or a connection between suitableoperative parts of the press and the tympan, the link 18, by itsengagement with the shoe, brings the disk to position on the upwardmovement of the tympan, and the disk 16 revolves the shafts 15 and 20sufficiently to throw the gripper from engage ment with the sheetprinted, the spring 29 holding the grippers in this position, asheretofore described. hen the printed sheet is removed and anothersubstituted, the tympan is carried downward in direction of the bed, andat the first movement the pin 17, riding upon the cam-surface of thebed-shoe, revolves the disk. 16, and through it the shafts 15 and 20,sufficiently to carry the crank-arm 22 of the upper shaft downward pastits center, whereupon the spring 29 immediately acts to press thegrippers against the sheet; This action takes place almost immediatelyupon the slightest downward movement of the tympan.

I desire it to be understood that, although specific construction hasbeen shown and described, I do not confine myself thereto, as equivalentconstruction may be substituted; that for the shoe device here shown fora press working a full form I may substitute one of suitable length andform to place the cam-surface of the same in, engagement with thewrist-pin, and thatI may use gripper bars or rests in such case in orderto secure the same result in working a form smaller than the press uponwhich said attachment may be placed as is secured in working a fullform; that for side guards or shields attached to the lower end of thetympan-frame the same may be secured to the sides of the frame andoperated automatically, and that for the spring herein described aspiral spring may be substituted, and springs of either construction maybe so located as to adapt them to use on hand-presses of any form ofconstruction to which this improvement may be attached, or whennecessary for the purposes set forth herein a positive movement in bothdirections may be substituted, the automatic operation of the same to besecured upon the general plan herein set forth and described, andillustrated by the accompanying drawings.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The combination, with a bed, of a tympan hingedthereto and provided at its hinged and distal ends with parallelgripper-carryingshafts, connections between said shafts, and anactuatingmechanism connecting the lower or inner gripper-shaft with thebed for auto 1 matically operating both gripper-shafts by the singleactuating mechanism by the movement of the tympan, substantially as setforth.

2. The combination, with a bed, of the tym? pan hinged thereto, parallelrocking grippercarrying shafts mounted on the distal and hinged ends ofthe tylnpan and connected together, a spring acting to close thegrippers, and a crank and sliding-link connection between the lowergripper-shaft and the bed for opening the grippers against the action ofthe spring, substantially as set forth.

3. In a device of the character described, the combination, with a bedand a shoe attached to the bed and provided with a cam surface, of atympan hinged to the bed, an upper and a lower shaft journaled on thetympan, rods connecting the said shafts, a crankdisk secured to thelower shaft and provided with a wrist-pin adapted to engage thecamsurface of the shoe, a link attached to the wrist-pin and held toslide in the shoe, grippers attached to the shafts, a crank-arm securedto the upper tympan-shaft, and a spring attached to the tympan andconnected with the said crank-arm, substantially as and for the purposeset forth.

at. In a device of the character described, the combination, with a bed,an adjustable shoe provided with a cam-surface and attached. to the bed,and a tympan hinged to the bed,

of an upper and lower shaft journaledupon the inner face of the tympan,grippers attached to each shaft, head-blocks attached to correspondingends of the shafts, connectingrods uniting the said head-blocks, a diskattached to one end of the lower shaft, a wristpin carried by the diskand engaging with the cam-surface of the shoe, a link attached to thewrist-pin and having movement at one end in the shoe, a crank-armattached to the upper shaft, and a spring secured at one end to thetympan, the free end of which spring is connected with the crank-arm, asand for the purpose set forth.

5. The combination, with the bed and the hinged tympan, of a rockinggripper-shaft mounted on the tympan parallel with its axis and providedwith a crank and wrist-pin, a cam on the bed in the path of theWrist-pin, and a link pivotally connected at one end with the wrist-pinand having a sliding connection at its free end with the bed,substantially as set forth.

LORENZO D. CLARK. Witnesses:

A. B. CARLooK, MARTIN O. BEEM.

